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packages/shared/src/xp.ts

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+import type { AdventureItemState, XpSource } from "./types";
+
+export const XP_AWARDS = {
+  daily_visit: 5,
+  adventure_started: 10,
+  adventure_partial: 25,
+  adventure_done: 40,
+  reflection: 30,
+  spiritual_per_check: 5,
+  spiritual_daily_cap: 25,
+  reading_per_10_pages: 15,
+  reading_daily_cap: 60,
+  exercise: 50,
+  exploration: 100,
+  weekly_review: 150,
+  rest_day: 15,
+  book_complete: 200,
+} as const;
+
+export const DAILY_SOFT_CAPS: Partial<Record<XpSource, number>> = {
+  adventure_item: 200,
+  spiritual: 25,
+  reading: 60,
+};
+
+export function xpForAdventureState(state: AdventureItemState): number {
+  switch (state) {
+    case "started":
+      return XP_AWARDS.adventure_started;
+    case "partial":
+      return XP_AWARDS.adventure_partial;
+    case "done":
+      return XP_AWARDS.adventure_done;
+    default:
+      return 0;
+  }
+}
+
+export function applyDiminishingReturns(
+  amount: number,
+  earnedToday: number,
+  softCap: number
+): number {
+  if (earnedToday >= softCap) {
+    return Math.floor(amount * 0.25);
+  }
+  if (earnedToday + amount > softCap) {
+    const atFull = softCap - earnedToday;
+    const over = amount - atFull;
+    return atFull + Math.floor(over * 0.25);
+  }
+  return amount;
+}
+
+export function xpForReadingPages(pages: number): number {
+  return Math.floor(pages / 10) * XP_AWARDS.reading_per_10_pages;
+}